在本研究中我們將試圖要以單一的壓控震盪器架構，設計改善一般壓控震盪器相位雜訊不好的缺點，嘗試以設計諧振電路配合壓變電容之方式進行改善。實際的VCO最後仍必須加以封裝，由於封裝的寄生效應，可能導致VCO內部干擾以及頻率飄移問題，其準確解有賴於全波數值電磁模型之建立。我們希望建立HFSS(High Frequency Structure Simulator)結合ADS軟體的模擬流程，能夠在設計VCO初期，就可以預測其封裝後的頻率響應與性能參數。藉由實作與VCO量測，發現模擬與量測結果相當吻合，顯示我們的研究能節省產品設計所需的時間與成本。

In this thesis, voltage-controlled oscillators (VCOs) with improved phase noise are designed and implemented. In the design of the resonant circuit varactor diodes are employed. In practice, a real VCO has to be packaged. The parasitic effect of the package may generate crosstalk inside the VCO and result in frequency shifting. To obtain an accurate prediction, a full wave model is developed. A simulation procedure is established combining High Frequency Structure Simulator (HFSS) with Advance Design System (ADS) software to predict the frequency response at the initial stage of the VCO design. Prototypes have been constructed and the characteristics measured. The simulation agrees with the measured results well. The obtained result show that our study can be used to cut the development time and cost.

目錄
誌謝Ⅰ
中文摘要 Ⅲ
英文摘要 Ⅳ
目錄 Ⅴ
圖表目錄 Ⅵ
第一章 序論1
1.1 研究動機 1
1.2 研究方法 1
1.3 論文大綱 2
第二章 電壓控制震盪器設計理論 3
2.1 微波壓控震盪器的基本原理 4
2.2 相位雜訊的形成機制 7
2.3 VCO重要規格 11
2.4 元件選取 13
第三章 1.8GHz與2.074 GHz VCO設計實作 20
3.1 Varactor diode選取及可調頻寬理論 20
3.2 1.8GHz電路模擬 25
3.3 實做電路與量測結果 30
3.4 2.074GHz VCO設計實作 34
第四章 1.751 GHz模擬分析與量測比較 45
4.1 Stripline 理論分析設計 45
4.2 電感模擬分析 49
4.3 1.751GHz VCO模擬與量測比較 54
第五章 結論 61
參考文獻 62

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